Malicious PDF — malware analysis report

Static analysis result for SHA-256 de733f696e076247…

MALICIOUS

PDF

124.1 KB Created: 2021-06-06 17:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4a734e42477e109625976cf823c9d759 SHA-1: 8c1a3780b7d41ecf9df84b09c53992969bc5ea9c SHA-256: de733f696e0762475575622a92e9333c494f12d1c2136e8dfbb565b6c33759bf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains heuristics indicating it is a link farm on disposable hosting and is flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL, https://smidgel.ru/pbw?utm_term=microsoft+activex+data+objects+6.1+library+vs+2.8, is the primary indicator of malicious intent, likely leading to a phishing page or further malware download. The document body, though heavily obfuscated, contains references that align with the URL's theme, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/pbw?utm_term=microsoft+activex+data+objects+6.1+library+vs+2.8 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408471/normal_5ff488488b01e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464874/normal_60b3be78a759e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_6026793fbcba0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fcdf1d881a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_606a5a2a3aa4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144559818/little_red_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef4330fd-f065-4cbc-95f5-a86e74687f5c/what_is_the_boy_scout_pledge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b627ed3a-80d6-4afe-a787-79cb987367c6/essential_physics_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1890a2-a77f-4b66-9455-1fec885aa0d3/30315215531.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/how_to_program_warm_tiles_thermostat.pdfIn PDF document text
    • http://pokatufaxi.pbworks.com/w/file/fetch/144596145/creative_advertising_agency_profile.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/dressing_up_adverbs_worksheet_1.5_b_answer_key.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/singapore_math_fraction_word_problems_grade_6.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/labojubekapibar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48740b6c-bf3c-4012-9822-57079550cb6a/united_states_attorneys_office_los_angeles_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bdd8b29-9620-4135-830c-e42a0dbc78bf/fafibobivira.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/what_is_psychoanalytic_theory_of_personality.pdfIn PDF document text
    • http://difusowafid.pbworks.com/f/what_is_the_default_password_for_night_owl_dvr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d98ec0-23d3-4999-ae75-a2527eb3d993/york_gas_furnace_reviews_canada.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144416958/resignation_letter_format_in_word_hindi.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/17th_anniversary_color.pdfIn PDF document text
    • http://pesivop.pbworks.com/f/83714503836.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144527694/bulewarazukebimolob.pdfIn PDF document text
    • http://najapenoz.pbworks.com/w/file/fetch/144541053/factory_reset_jvc_kd_r520.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 31472 bytes
SHA-256: 4a92a50a68305eb548a083ec3acc8111d4a74918addb1ea19d0d56019ed18a1e
font_01_sfnt_off00017643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17643 5712 bytes
SHA-256: e546c9ccfe377bb66421ce6b9dbdb60d704d1cf6dd0173e4421197986cbb4dd4
font_02_sfnt_off000189eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189EB 16816 bytes
SHA-256: af2e36ae3964007377eafa7bfe4439c00b708a3041f00bf92e43d1b4a24eab57
font_03_sfnt_off0001be14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE14 16144 bytes
SHA-256: d2d14ee152591f1391b9c182731dc81228c2f3de4d706c9bd7d93c14ae925181
font_04_sfnt_off0001d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D311 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176